Grab for transporters, excavators, and the like.



F. SOCHOR.

GRAB FOR TRANSPORTERS, EXCAVATORS, AND THE.LIKE. APPLICATION man n lLY22. 1911.

1,142,637. Patented-June 8, I1915.

3 SHEETS-SHEET l.

F. socHoII.

GRAB FOR TRANSPOHTERS, EXCAVATORS, AND THE/LIKE.

APPLICATION FILED IuLY22,1911.

l 3 SHEETS-s115111 2.

F. SOCHOR. GRAB FOR TRANSPORTERS, ExcAvAToR-s, AND THE LIKE.

APPLlCATlON FILED IULY 22,1911.

Patented June 8, 1915.

3 SHEETS-SHEET 3- m Re 5 Q E 0 Ww n #y 6 FRIEDRICH SOCHOR, 0F VIENNA,AUSTRIA-HUNGARY.

GRAB FOR TRANSPORTERS, EXCAVATORS, AND THE LIKE.

Specieation of Letters Patent.`

Patented J une 8, 1915.

Applieaticm filed July 22, 1911. Serial No. 639,913.

T0 aZZ lwhom, it may concern Be it known that I, FRIEDRICH SooHoR, asubject of the Emperor of Austria-Hungary, residing at Vienna, Empire ofAustria-Hungary, have invented certain new and useful .Improvements inGrabs for Transporters, Excavators, and the like; and I do herebydeclare the followingtobea full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to grabs with variable gearing speciallysuitablefor the handling of material in large pieces. The draw-4 backs 'of suchgrabs as previously constructed reside in their great height necessaryto obtain a suiciently large opening, great weight owing to theconsiderable power required to close the jaws of the grab, and theconsequence is that the crane is compelled to 4 at the ends of thesupporting bar to attachment points on the arms, for the purpose ofeffecting a large opening `of the bucket halves vwhich latter separateowing to their own weight, their additional opening being effected onlyto a smallextent by the pull of the said ropes.

' The invention is illustrated by way of example in the accompanyingdrawings, in whichzy Figure 1 is an elevation, Fig. 2 a plan, Fig. 3 anend elevation, and Fig. 4 a side elevation of the grab in openedposition, Fig. l 5'is .a side elevation, F-ig. 6 a plan of a 50modiication.

In the drawings a denotes along horizontal supporting. bar at the endsof which are pivoted arms b b and b1 b1 for thetw bucket halves c andc1,A rigidly attached vto theV said arms. The arms are pivoted to thebar a on pins d d and d1 d1. The devices for the closing and opening ofthe bucket halves are separate.

The opening device comprises cranks h Zz, and connecting rods f f and f1f1 arranged with a view to the rigid cooperation of the bucket halves,and driving ropes Ze Z2 attached outside to the arms or to the cranks Ith. The operation of the mechanism is the lsame whether the opening ropes7c are attially horizontal lines whereby the pins e c are caused to moveto the left and right re.

spectively so that the bucket halves are opened. In the latter case,that is to say,

when the opening ropes are attached to the arms b b, b b', say to thepins or bolts e e', then on pulling the opening ropes these pins orbolts e e move in the same direction Ias in the former case, whereby thebucket halves are opened and through the medium of the connecting rods fand f the cranks are turned around the axis Z in the same direction asin the former case. Consequently it makes no difference at all whetherthe iopenl ing ropes la are attachedto the cranks or directly to thearms b b, b b. These cranks maybe as in the present case loosely mountedon a shaft Z journaled inthe supporting bar a. When the ropes lc c areattached to the cranks, these are formed as shown. in dotted lines inFig. 1 and the ropes are attached'to pins i i while the connecting rodsf f and f1 f1 are jointed at one end to pins gg and g1 g1 0n the cranksand at the other end to pins e e and e1 e1 on the bucketarms. In theother case however,the pins Z i are omitted and the ropes are attaced toany suitable point on the arms b b and b1 b1, such as to bolts e and e1whence they pass over .rollers -w w journaled in the end of thesupporting bar a. Byl means of the connecting rods which are positivelyconnected to the cranks mounted on the supporting bar a the position ofthe two bucket arms with respect to the bar a and to each other isexactly and positively determinedso that a tilting or displacement ofthe supporting bar a owing to the resistance encountered by the edges cand 'v1 in the material to be transported, is impossible and anyposition elo other than the symmetrical posltion of the bucket halveswith respect to the center line cannot occur.

The closing mechanism consists of pulleys p s s1 and t t1 mounted inbrackets fu, u at,

tached to the arms t b and b1 b1, from which 'pulleys ropes 1' 1" passover two drums o o. These latter and the two closing drums n fn,-

which also acts to prevent the grabfromV sinking too deeply inv thematerial. |llhe grab is thus protected from excessive overloading andthe shield distributes the material picked up by pushing against theouter ends of the bucket halves.

rllhe supporting bar a is made so long that when the grab is closed thepivots d and Z1 lie nearly above the outer ends of the bucket halves sothat the whole Width is utilized and, moreover, owing to the position ofthe bucket halves on the arms 'to which they are rigidly connected andthe suspension of the latter at'the ends of the long support a, thesurfaces of the bucket halves even when the grab is widest open are notvdirected vertically against the material but lassume a favorableposition for shoveling up the ma terial. With the improved constructionthe result is that the opening takes place at irst owing to Vthe weightof the bucket halves since they when the closing ropes are slack swingby themselves about the pivots d and d1 into the position ofequilibrium. lln the second place the opening of the bucket halves isvery large with even a small angle of rotation as in consequence of thefar-out position lof the pivots Zand d1 the arms b and b1 are very longso that the edges lv and o1 of the grab describe a long arc with even asmall `angle of rotation. By simultaneously pulling the opening ropes lalc, the toggle lever 'effect of the crank it It and the connecting rodsf f and f f. or the direct pull of the opening ropes la on the arms b band b b', is exerted to the greatest extent, exactly at the last instantwhen the y bucket halves have swung past the position of equilibrium andtheir weight again opposes their opening. lWhen the grab is to be closedthe opening ropes 7c la are released and the closing ropes p p pulled.

ln the modification shown in Figs. 5 and 6, two cranks are used whichare compelled to turn simultaneously through the same angle in' oppositedirections by toothed seg# v porting amaca? ments la and h fast on theshafts lm of the said cranks and gearing into each other. rltheconnecting rods f f connect the crank pins g and g to the arms b b ofthe bucket halves c 0 at e e and rods el pivotally connect the crankpins g g to the opening ropes k ic. For opening the grab the rope isslackened, the grab opens by gravity owing to the fact that its rods arepivoted to the outer ends of the long horizontal supporting bar untilthe pins g, g have passed beyond their lowermost or dead centerposition, whereupon by pulling the opening ropes c k further movement ofthe cranks and connecting rods ff is caused.

lln all of vthe cases above described the crank pins g g' moverelativelyto the supbar a and in a direction substantially parallel to thelongitudinal aXis of such bar.

The technical advantages of the hereinbefore described improved grab maybe briefly summarized as follows: (a) Small overall height owing to theattachment of all the members to an upper horizontal support. (b)lEXceptionally easy and reliable opening owing to the location-far outof the pivoting points of the bucket halves and the powerful pull ortoggle lever edect at the end ot the opening motion. (c) Unusually wideopening due to the long bucket arms permitted by position of thepivoting points. (d) Favorable operation of the closing forces byutilizing the changing height of the-pulleys` during the closing motionand the said outer ends of such bar and having rigidly secured to theirouter ends bucket halves, cranks, revolubly mounted on the said baradjacent its center, connecting rods,

connecting such cranks with the said arms and engaging the latterintermediate the ends thereof, and means for separating the buckethalves including ropes connected to said cranks and other ropesextending down- .wardly around the said bar pulleys and 4connected tothe' arms intermediate the ends of the latter..

lin testimony whereof, ll affix my signature, in presence of twowitnesses.

FRlllEDRllCll-l SCHR. Witnesses z ARTHUR BAUMANN, AUGUST lFUGGEn.

